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Desuperheating

Steam Desuperheaters and Process Gas Coolers are designed to reduce temperature by bringing heated gas into direct contact with a quenching liquid that is evaporated, thereby cooling the gas.

Desuperheater selection is usually dependant on the operating characteristics required by the customer.

6905 Mechanical Dump Desuperheater
The Type 6905 Mechanical Atomizing Dump Desuperheater is designed to be an emergency desuperheater, which protects main turbine condensers or similar types of equipment when steam dumps occur. The operating principle is that high-pressure water liquid is sent through radially located nozzles on a pipe carrying the gas to be cooled. The water is atomized and evaporated in the gas stream thus cooling the steam in amounts equal to the enthalpy change plus the vaporization value of the cooling medium.

6910 Surface Absorption Desuperheater
The Type 6910 Surface Absorption Desuperheater is a unique unit in a compact design that allows for infinite turndown (large flow rate variation) and saturated characteristics on the discharge. The operating principle is that water is injected into the desuperheater onto a baffle plate that distributes water across the reaction rings. The reaction rings provide a large surface area over which the hot vapour is forced to pass. The hot gas is then cooled by absorption of the water when contacting the reaction rings. The saturated vapour flows out of the desuperheater outlet and excess water drains through the bottom and is removed through a trap. The reaction rings in the Type 6910 unit extend the cooling water surface, a feature not available in other units.

6940M, 6940 & 6950 Venturi Desuperheater
Type 6940M, 6940 and 6950 are Venturi Desuperheaters. Water entering the desuperheater is preheated in the circulatory chamber around the water diffuser tube and is introduced in many small jets to assist final atomisation by the steam flow through the center of the throat. When leaving the throat, the mixture of steam and water enters the venturi section for turbulent mixing prior to entering the main steam line in a fog-like condition without contacting the sidewalls. This provides maximum desuperheating effectiveness and a minimum of wear in the discharge piping. The Type 6940M Desuperheater is a miniature version of the Type 6940. It was developed to handle small quantity steam applications found in heating, air conditioning and process industries.

6952 & 6953 Attemperator Desuperheater
The Type 6952 and 6953 are Attemperator Desuperheaters. Water entering the desuperheater is preheated in the circulatory chamber around the water diffuser tube and is introduced in many small jets to assist final atomisation by the steam flow through the center of the throat. When leaving the throat, the mixture of steam and water enters the venturi section for turbulent mixing prior to entering the main steam line in a fog-like condition without contacting the sidewalls which provides maximum desuperheating effectiveness and a minimum of water in the discharge piping.

6970 Atomizing Desuperheater
The Type 6970 are ejector-type steam Atomizing Desuperheaters which require a relatively small amount of high pressure steam, which draws the cooling liquid into the atomising head, so producing a fog which is discharged into the main steam line. Due to the fine atomisation of the liquid this allows intimate mixing and cooling of the steam. This type of unit can generally offer a higher turndown and is not subject to the same velocity constraints as with the venturi type units, therefore this type of unit will be more economical especially when larger pipe sizes are required. Turndown in excess of 50:1 can be achieved in many conditions.